duffy



2 Sheets-Sheet 1.

(No Model.)

J. J. DUFFY.

FLUID PUMP 0R oomrnnsson.

Patented Aug. 16, 1892.

II v 1 I 4 A -Ll lll V V// 443/611. e Jaea (No Model.) 2 SheetsSheet 2.

. J .J DUFFY.

FLUID PUMP 0R COMPRESSOR.

No. 480,811. Patented Aug. 16, 1892.

IIIIIIIIIIIIMIHIIMIW IIIIIIHIIIIIIIIHII is IIIHI I1 I ll .I llllllUNITED STATES PATENT OFFICE.

JOHN J. DUFFY, OF CLEVELAND, OHIO, ASSIGNOR TO EDWARD P. BATES, OF

SAME PLACE.

FLUID PUMP OR COMPRESSOR.

SPECIFICATION forming part of Letters Patent No. 480,811, dated August16, 1892.

Application filed October 5, 1891. Serial No. 407,736. (No model.)

T on whom it may concern: of the suction-valves c c, and D D representBeit known that I, JOHN J. DUFFY, of Olevethe chambers of thedelivery-valves d 61, hereland, in the county of Ouyahoga and State oftofore employed. The construction and ar- Ohio, have invented certainnew and useful rangement of these valves and chambers are 55Improvements in Fluid Pumps or Oompresstoo well known to requiredescription in this ors; and I do hereby declare thefollowspecification. Suctionvalve chambers O 0 ing to be a full, clear,and exact description are of course in open relation with cylinder ofthe invention, such as will enable others or barrel A, as at 0 and headsA A are skilled in the art to which it pertains to make chambered, as ata, to make open communi- 60 IO and use the same. cation with cylinderAand accommodate the My invention relates to an improved fluid movementof delivery-valvesEE hereinafter pump or compressor especially welladapted described, and passage-ways a are provided for compressingaeriform bodies. for conducting the fluid from chambers to to Myinvention consists more especially in the valve-chambers D D or directlyto are- 65 r 5 the provision of adelivery-valve wherebythe ceiver. (Notshown.) Valves d d, in confluid that has been received and accumulatednection with my improved fluid pump or comin the cylinder or barrel ofthe pump orcompressor, constitute check-valves and may be pressorbetween the piston and said valve will dispensed with, if desired. allbe discharged during the next succeeding E Erepresentmyimproveddelivery-valves 7o :0 stroke of the piston without the possibilitylocated, respectively, at opposite ends of cylof any of the fluid thusdischarged to return. inder A. These valves comprise,respectively, Myinvention consists, also, in the combia disk or cylinder reduced indiameter, as at c, nation, with such delivery-valve, of the stuifthereduced section fitting nicely within cyling-box of the piston-rod; andit consists, also, inder A, the ends of the latter constituting 75 incertain features of construction and in comthe seats for these valves.Valves E E are bination of parts hereinafter described, and fluted ormilled or provided in any suitable pointed out in the claims. mannerwith alternating depressions and ele- In the accompanying drawings,Figure 1 is vations on their peripheries, as at 6, whereby a verticallongitudinal central section of a numerous channels are formed for theescape 8o 0 double-acting fluid pump or compressor emof the fluid fromcylinder A when the valves bodying my invention, showing the piston inare lifted off their respective seats.

its movement toward the right-hand end of Between delivery-Valve E andhead A is the cylinder. Fig. 2 is a vertical longitudilocated a springF, preferably a coil-spring,

nal section of the right-hand end of the pump as shown, head A and valveE having, re- 8 5 or compressor, showing the delivery-valve Espectively, the latter a depression, as at 6 moved by the pistonsomewhat farther from and the former an inwardly-projecting flange itsseat. Figs. 3 and 4 are respectively the or member, as at a wherebyspring F is former a plan View and the latter a side elemaintained in acentral position relative to vation of said delivery-valve, showing morevalve E and perpendicular with said valve. go clearly the constructionof said valve. The construction and arrangement of head A represents thefluid cylinder or barrel of A and delivery-Valve E, employed at the i adouble-acting fluid pump or compressor, the other or opposite end ofcylinder A, as shown, same being preferably enveloped by a wateraresubstantially the same as the construction jacket A. and arrangement ofthe corresponding parts 5 A A represent the respective heads of the ofthe right-hand end of said cylinder already fluid or compressorcylinder. described, excepting that valve E is elon- B represents thepump or compressor pisgated and extends through head A the latter ton,and 13 its piston-rod, the latter connectbeing correspondinglyperforated and termiing with a piston working in the steam-cylinnatingin a sleeve a that, in conjunction with too der S of the pump orcompressor. gland a and packing a interposed between C 0 represent,respectively, the chambers the sleeve and valve E and held in place bythe gland, constitutes a stuffing-box for said valve, gland a beingtightened by bolts a, connecting the gland with head A of cylinder A. Asshown, delivery-valve E also terminates in a stufling-box-viz., for thepistonrod, being chambered for receiving packing b and a follower b, andbeing screw-threaded externally for receiving the correspondinginternally-threaded cap 12 for tightening the follower of thestuffing-box.

As piston B moves from left to right, a shown in Fig. 1, of coursedelivery-valve E will be opened and suction-valve will be closed, andwhen the piston has made contact with valve E the entire fluid contentsof the cylinder A at the right of said piston previous to said stroke ofthe piston will have been discharged. The piston may or may not movefarther-that is, lift valve E farther from its seat against the actionof spring F, as shown in Fig. 2. In either case, as the piston recedesor commences its return stroke delivery-valve E, under action of springF, will return with the piston, maintaining close contact with thepiston until the valve will again have resumed its seaton the end ofbarrel or cylinder A, and it will therefore be seen that there is nopossible opportunity for any of the fluid just discharged from cylinderA to return. Delivery-valve E having reoccupied its seat, as justdescribed, and piston B continuing in its return stroke, suction-valve 0will be opened, admitting a new supply of fluid into cylinder A at theright-hand side of the piston, while the fluid that during the precedingstroke of the piston has accumulated on' the opposite or left-hand sideof the piston is being discharged, suction valve 0' having closed anddelivery valve E and checkvalve (1 (if the latter is employed) havingbeen opened. Piston B willcontact with valve E and likely move itfarther from its seat, the operation and result being substantially thesame as described in connection with valve E, except that valve E may ormay not have a spring F connected therewith, as the pressme of the fluidcontents remaining in the chamber of head A together with the ordinaryatmospheric pressure, will be sufficient in most instances to maintainvalve E in contact with the piston until the valve has reoccupied itsseat on the end of cylinder A. In case, however, a spring is employedthe same is confined on the valve within chamber a of head A immediatelyat the rear of the enlarged section of valve E, as shown in Fig. 1.

Vith my improved pump or compressor it will be observed that all thefluid at the respective side of the piston in the fluid-cylinder of thepump or compressor is entirely discharged without the possibility of thesame returning to said cylinder, and hence the f unctions of the pumpare not interfered with, as is the case with the pumps heretoforedevised.

Of course if my invention were embodied in a single-acting pump orcompressor but one delivery-valveviz., the valve having the piston-rodstuffing-box combined therewith would be employed and the advantages ascompared with single-acting pumps or compressors heretofore devisedwould be equally marked.

What I claim is 1. In a fluid pump or compressor, the combination, witha fluid-cylinder having outlets at its extreme ends, a piston, andvalves constructed to move in the ends of the cylinder and havingair-passages formed between them and the wall of the cylinder, ofair-chambers formed outside of the valves and in commu- "nication withthe airpassages, valves in the passage-ways constructed to permit thefluid to flow outward, and suction-valves in the cylinder, substantiallyas set forth.

2. The combination,withacylinder open at one or both ends and piston, ofa deliveryvalve seated at the open end or ends of the cylinder andhaving a reduced section extending into the said cylinder and havingalternating depressions and elevations on its periphery, substantiallyas set forth.

3. In a double-acting fluid pump or compressor, a delivery-valve seatedat each end of the fluid-cylinder of the pump or compressor, said valvesbeing adapted to be engaged when havingbeen removed from theirrespective seats by the piston of the fluid-cylinder, one of said valveshaving a spring connected therewith and the other delivery-valve beingperforated for the passage of the piston-rod and extending outside theadjacent head of the fluid-cylinder and terminating in a stuflingbox forthe piston-rod, said adjacent head of the fluid-cylinder alsoterminating in a stuffing-box for said last-mentioned valve, substantially as set forth.

4. In a fluid pump or compressor, a delivery-valve seated at the end ofthe fluid-cylinder and having a reduced section extending into saidcylinder and having alternating depressions and elevations on itsperiphery, substantially as and for the purpose set forth.

In testimony whereof I sign this specification, in the presence of twowitnesses, this 18th day of September, 1891.

JOHN J. DUFFY. Witnesses:

O. H. Donna,

WARD HOOVER.

